{
  "coverage": [
    "The legacy CSE range and the candidate's currently stored output range coincide; a dynamic array can resize or be blocked when Excel recalculates.",
    "The validator checks stored formula mode and metadata only. It does not calculate a result, predict a future spill extent, identify blockers, or assert client-version compatibility."
  ],
  "coverage_expectations": [],
  "facts": [
    {
      "baseline_mode": "legacy_cse",
      "baseline_output_range": "B1:B3",
      "candidate_mode": "dynamic",
      "candidate_output_range": "B1:B3",
      "cell": "B1",
      "formula": "=LEN(Inputs!A1:A3)",
      "kind": "array_formula_mode_changed",
      "sheet": "Model"
    }
  ],
  "family": "structural",
  "id": "structural.array_formula_mode_changed",
  "must_reach": [
    {
      "source": {
        "cell": "B1",
        "sheet": "Model"
      },
      "targets": [
        {
          "cell": "B2",
          "sheet": "Dashboard"
        }
      ]
    }
  ],
  "review_expectation": "block",
  "schema_version": 3,
  "title": "An unchanged array formula switches from fixed CSE to dynamic spill semantics",
  "topology": "pair"
}